Drill-sharpening machine.



J. G. LE'YNER. DRILL SHARPENING MACHINE. APPLICATION FILED APR. 1, 1912.

- Patented Nov. 11, 1913.

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W faesse's W/iw J. G. LEYNER. DRILL SHARPENING MACHINE. APPLICATION FILED APR. 1, I912.

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, Patented N0v.11,1 913.

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JOHN GEORGE LEYNER, OF DENVER, COLORADO, ASSIGNOB TO THE J. GEO. LEYNEB ENGINEERING WORKS COMPANY, OF LITTLETON, COLORADO, A CORPORATION OF COLORADO.

ZDRILL-SHARPENING MACHINE.

Patented Nov. 11, 1913.

Application filed April 1, 1912. Serial No. 687,847.

To all whom it may concern:

Be it known that I, JOHN GEORGE LEYNER, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented a new and useful DrilLSharpening Machine, of which the-following is a specification.

My invention relates to fluid actuated die formed forgings making machines that are adapted to be used in the forming, sharpening, and shanking of rock cutting drill bits, and that is also adapted to be used for making a great variety of small sized die formed forgings, and the objects of my invention are: First, to provide a forging machine that is provided with a hammering, pressing and gripping vise, one aw of which is a fixed stationary die jaw arranged on an anvil portion; the. other jaw of said vise is a reciprocally moving jaw that is adapted to be carried by a reciprocating hammer block that is arranged and adapted to reciprocate to and from the anvil and its stationary-jaw and is arranged to strike hammer blows which actuated by fluid pressure against the stationary die jaw of the anvil, the jaws of said vise being interchangeable die jaws of such different shapes and forms as are necessary to form various articles such as bolts having heads of different shapes, chisels, nuts, gads, handles of various kinds, spikes and various other articles, and especially the forming, shanking and sharpening of rock cutting drill bits on round, hexagon, cruciform, octagon, or other forms of merchant bar toolsteel used for rock cutting drill hits, such tool steel being either solid or provided with an axial aperture throughout its length, and known as hollow tool steel. Second, to provide a die-formed forgings making machine that is adapted to be used as a drill bit forming, shanking and sharpening machine, and which is ar-' ranged to strike either lightor heavy ham- -mer blows and 1s arranged to give to drill steel or metal bars, clamping, gripping, squeezing, swaging and holding pressures of any desired degree of power, which may be applied at the will of the operator,'in the forming, shaping and sizing of rock cutting drill bits, and for doing any other character. of forging work within the capacity of the machine. I attain these objects by the mechanism illustrated in the accompanyingdrawings, in which: i

i two ir'rdependenthalf die jaws in which dif- Figure 1, is a side view of my improved d1e-formed. forgings making machine,partly "in section. Fig. 2, is a transverse, vertical sectional view of the same. Fig. 3, 1s a front view of the upper portion of the machine. Fig. 4, is a plan view of the anvil portion of the machine, the support for the dolly operating cylinder being. omitted. Fig. 5,

1s a side View of a completed drill bit; and Fig. 6, is a perspective View of a pair of dies used in the production of the drill bits. Similar letters of reference refer to simi lar parts throughout the several views.

Referring to the drawings, the numeral 1 designates a column that forms the foundation base portion of my die-formed forgings making machine, and hereinafter termed the base. This column. form of base is provided with a floor flange port-ion 2, and with a top flange portion 3, on the upper surface of which a slightly raised boss 4 is formed. The outside rim portion of this top flange 3 is provided wit-h a circular row of holes 5, and the top of the base and rim is also cored out and an axial piston bore (3 is formed in" the column portion of the base, at the lower end. of which: an air inlet and exhaust aperture 7, is formed,.that extends through the side of the base and is adapted to receive the end of an air supply pipe 9, that extends from this 'inletaperture to the air distributing throttle valve chest 10, of the machine, which will be described hereinafter. This top flange portion 3 of the base 1, supports a cylinder 8, that is provided with a bottom edge flange portion 11 that is secured to the flange by any suitable means, preferably by means of cap screws 12, which are threaded nito'it from the under side of the flange.

. This cylinder comprises a casting, preferably of circular form and containing an axial piston head bore 13, which is arranged to register in vertical axial alinement with the pisten bore in the supporting base of the machine, but which is made much larger in diameter for a purpose which will be hereinafter described. The top of this cylinder is provided with a vertically projecting block portion-14, which I term the anvil block, the centralportion of the top surface of which ,is provided with a die vise, described and;

claimed in my copend'ing application Serial No. 690,585. This die vise is composed of fer'en'tshaped die recesses are formed, and

[finish the article, another and different set of die jaws may be used. I preferably illustrate and describe, however, a set of die jaws especially adapted to'the sharpening of drillb'i-ts, and the anvil block is provided with a die jaw 15, which forms one jaw of the drill steel gripping vise. This die jaw has a head end portion 15 and a body portion 15 and it is of half round or semi-circular form,

, and at the junction of the head and body so. der 18 between them, to which the doveportion, an inwardly beveled shoulder 16, is formed, which makes a dove-tailed form of recess between the shoulder and the body of the jaw. This jaw sets into a semi-circular shaped recess 17, which is made in two different diameters, 17 and 17 which are formed in the topof the anvil with a similarly inwardly beveled or dove-tailed shoultailed shoulder of the jaw looks so that the jaw cannot be raised straight up out of the recess, and the inward bevel of the shoulder tends to draw the j aw down into and against the bottom of the recess. ranged in the recess 50 that the end of its head portion will come even with the adj acent side of the anvil, and the jaw is secured in the recess by a bolt 19, which is placed in a groove 20, that is formed in the bottom of the recess 17, and atthe inner end of this groove a recess 21 is formed, that is adapted to receive the head of the bolt 19. The threaded end of the bolt extends beyond the adjacent face of the anvil, and a washer 22, is mounted on it and overlaps onto the head end of the jaw, and a nut 23 is threaded onto the threaded end of the bolt and is turned to clamp the washer against the side of the anvil and forces the shoulder of the jaw into the dove-tailed shoulder of the recess in the anvil and rigidly and firmly locks the jaw to the anvil.

The other die jaw 24, of the drill steel gripping vise is made exactly like the jaw 15,

and it is set into a similar shaped and shouldered recess 24.", formed in the underside of a cross head hammer block 25, which is reciprocally mounted above the anvil and is arranged to strike vertically reciprocating hammer blows against its jaw and against such other jaws and former dies as may be a secured 'to the anvil.

The upper jaw 2:, of the dr ll steel grip- This jaw is arping vise is secured toits recess with its face even with the adjacent side of the hammer block by a bolt 26, which is inserted in a groove 27, at the inner end of which a recess 28 is formed for the head 29 of the bolt to fit into. The outerend of the bolt is threaded and is provided with a washer 30, and with a nut 31 that clamps the upper jaw against and into the recessed shoulder of the cross head. Inasmuch, however, as these jaws have to be removed and replaced by others of different die forms, and as this upper jaw holding bolt would fall out of its groove in the cross head every time the upper jaw was removed, if not secured in .the groove, it is necessary that some means be employed to hold it securely in its groove when its nut 31 is loosened and the jaw is removed. And while there are a number of ways in which this bolt may be secured in its groove, I preferably secure it in such a manner that it will remain securely in the groove and at the same time may be readily removed and be replaced by a new bolt when necessary In the hammer block, in alinement with the groove in which the bolt fits a hole 32 is drilled from the inner wall of the recess in which the head of the bolt fits, and in this hole I place an expansive coiled spring 33, which is arranged and ada ted to bear against the end of the head 0 the bolt with sufiicient pressure to clamp the inside head of the bolt tightly against the opposite side of its recess and hold it in its groove. I

The die jaws 15 and 24 have fiat meeting faces which are provided with two different shaped die recesses 35 and 3G. The recess 35 is a straight circumferentially curved recess that extends along the greater portion of the length of each of the aws and is of a size when both jaws are closed together, to grip the bar of drill steel on which rock cutting lips are to be formed, and the recess 36 is a circumferentially curved tapering recess that flares divergingly outward from the inner end of the straight die recess of the jaw to the end of its head end portion, and is adapted to form a diverging tapering neck pow tion on the bar of the drill steel that extends from the body of the bar of steel to the outside peripheral diamcter of its rock cutting lips end of the bar of drill steel, and the end of the bar of steel which is heated is upset by the reciprocal movements of the dolly to completely fill this tapering diverging recess of the jaw dies and form the rock cutting lips on its face end, as will be fully described hereinafter. This pair of circumferential curved form of recessed jaw dies is especially adapted to grip and hold round bar drill steel, but die jaws are made with cruciform, hexagon, octagon, or other forms of die recesses. These die jaws preferably extend across the width of the top of the 1,wa,'eoa

anvil and hammer block, but. that end portion of the die jaws that grips and holds the body of the bar of drill steel of the drill bits can be extended rearwardly beyond the anvil portion, and when die jaws are used that are longer than the width of the anvil, a

shelf portion 38 is formed below the top of the anvil portion, and a similar shelf portion 39, is formed above the lower end of 19. the hammer block and opposite to the shelf 38, of the anvil, upon which supporting blocks, not shown, may be placed to support the overhanging rear ends of the die'jaws. These shelf portions 38 and 39, are made 15, long enough on the sides of the anvil and cross-head toreoeive two' pairs of former die jaw blocks 43 and 44, which are made to fit on the shelves, and to be clamped thereon by the clamping plates 41, which are bolt 2Q, ed to the adjacent sides of the anvil and the hammer blocks, by bolts 42, and are arranged so thattheir top edges lap over onto the adjacent ends of these die aw former blocks, and clamp them against the sides of 25,. the anvil and hammer block. I These two 'pairs of former die blocks are independent of each other, as shown, and they are placed on the shelves on opposite sides of the center of the anvil, thus leaving a clear unobsflr. structcd space between the shelves and between the former blocks to the drill steel gripping and dolly entering dies.

The former blocks 43 are provided with die slots 47, which are adapted to receive the ribs of cruciform shaped drill steel, and

the former blocks 44 are provided with a wedge-shaped projecting rib 48, for press ing out the corners between the ribs of cruciform steel, and also for pressing the 4-0 grooves 45 between the rock cutting lips 45 of four and six point drill bits, and which I term the clearance former block, but blocks may be used having slots or recesses or projections of different forms for 45 special kinds of die forging work.

' VVhe'n making rock cutting drill bits that are provided with five, six, or more .rock 2 cutting lips or points on either round, hexagon, cruciform, or other shape of drill n 3 steel, I employ one of the V-shaped blocks 44 on the shelf of the hammer block, and on the shelf of the anvil directly below it I'pl'ace a block 46 provided with a semicircular recess 47. Both of these blocks are arranged with their die surfaces inclining or tapering toward their bottom sides and toward the shelves on which they rest, and consequently their opposing die surfaces form a divergingly flaring space so between them in which the head end of the drill bit is placed, and the curved tapering portioliio 'ttthe head end of the drill bit rests in the semi-circular curved recess of the lowen'blook, and the V-shaped die block is used. to form the grooves 45, between the frock cuttinglips of the head by pressing or striking the V-shaped dies down into the heated head end of the drill bits by the reciprocal movement of the hammer block.

The ends of the anvil and hammer block that are on the same side of the machine as its throttle valve, are provided with a pair iof projecting lugs 49 and 49, that are provided with oppositely arranged faces that are out far enough below the main opposing surfaces of the anvil and hammer block ito receive flat plate jaws 50 and 50*, which iare placed on and are secured to them by any suitable means, but preferably by screws {50 These flat jaws are positioned to bring ;their top surfaces even with the top surface iof the anvil and with the anvil engaging (surface of' the hammer block. These flat plate jaws form a vise that-ais used to grip and hold drill steel metal bars and die forg- @ings of various kinds and drill bits between their different step forging treatments, ;when it is necessary to grip and hold them for any purpose, such, for instance, as for holding heated hollow drill steel, while a .cold steel pin is driven into them to preserve the round form and size of the aperture, while the shank ends are being formed :on them. I

The opposite ends of tlr: anvil and hammer block from theends that carry the fiat E jaws, arealso provided with projecting lugs 51 and 51*, which are formed with oppositely arranged faces that are out far enough below the level of the opposingsurfaces of theanvil and hammer block to receive a pair of shearing jaws 52 andSQ which are arranged to cut or trim orshear either 'cold or heated metal rods, bars, plates, or drill steel, either partially orwholly in two. These shearingja'ws may be secured to the opposing faces of these projecting lugs by any suitable means, but are preferably sefcured thereto by screws 52, and their shearing edges are arranged to slightly over- !lap in proper shearing relation.

The cylinder bores O in the column 1, and .18 in the cylinder 8, are of differential areas, and in them a piston head is reciprocally mounted, the opposite pressure engaging surfaces of which are also of differential areas. The upper end 53 of this piston head, is made in the form of a disk and is fitted reciprocally in the piston bore 13 of the cyl inder. This disk-shapedend 53 of the piston head is provided with a piston head extension portion 54, which is considerably smaller in diameter than the disk portion, and extends axially fromthe large dislo shaped piston head down into and fits reciprocally in the piston bore of the base of the machine.

The piston head 53 and its'extension 54, areprovided with annular grooves, in which .are placed packing rings- 55 which pre- &

vil blockto and through the disk, and theirhead portions 58 rest on top of the hammer their lower ends extend slid-' block," while ably'through apertures 59 and 60, formed in the anvil block into the cylinder, and they extend through the disk portion of the' pis- I a throttle valve,

portion of the cylinder.

' valve is provided with ton head, and their'lower ends are threaded and are provided with nuts 61, which preferably are of thimble form, which screw up against the bottom of the disk portion of the piston head. Set screws 61 are threaded through the nuts against the bolts-and act to lock the nuts to the bolts against accidei1- tal displacement. Apertures 62 are formed through the top flange of the base directly underneath and in alinement with these bolts and nuts, that enable these nuts to be turned on or off the ends of the bolts. These bolts are positioned on opposite sides of and at equal distances from the longitudinal axial center of the vise jaws of the anvil and hammer block, and they -are each provided with packing rings 62 which are arranged in that part-of their length that lies in the slideway apertures in the anvil block These packing rings prevent leakage of the compressed air or other actuating fluid through the bolt apertures from the upper portion of the cylinder around these bolts.

It is essential that the bolts be rigidly secured to, the hammer block inorder that they move and act together as an integral monolithic member, and While there are many ways in which these bolts may be rigidly secured to the hammer block, I preferably make them of steel and harden and grind and press them into and through the hammer block by hydraulic pressure, which method insures that they will have an equal and central bearing on all the area of the apertures into which they are pressed, and insures true axial alinement with each other and at right angles to the anvil engaging surface of the hammer block.

v The die forging machine is provided with to which the actuating fluid, which is preferably compressed air, flows from a source of supply through a hose or a pipe 64. This throttle'valve may be of any suitable type to reciprocate the piston in the cylinder in such a manner as to effect light or heavy or single or successive reciprocal hammer blow striking, or for effecting pressing, squeezing or swaging pressure movements of the hammer block and its die jaw against the die jaw of the anvil. This an operating handle 65 and the valve chest is preferably provided with stop lugs 66 and 67, and with a Iron bar gripping,

stopor indicating finger 68 to define the operative movement of the valve-disk 63. The actuating fluid is conveyed from the valve chest 10, through the ipe 9 to the lower end of the cylinder, be ow the lower end of the stem portion of the piston, and a port 69 extends to the top of the cylinder and enters itabove the large disk-sha ed head piston that is arranged to reciprocally drive and upset the ends of drill steel with dollies and formers and other character of dies that are adapted to work against the ends of steel or iron bars or ieces of an forging metal. This dolly or f drmer die d riving cylinder may be supported in any suitable manner on one side of the base'or of the anvil or of the cylinder, in operative relation to the center of the die jaw that is secured in the anvil.

y present invention contemplates the use in cobperating relation with my steel or pressing and hammering die jaws of any cylinder and piston mechanism arranged to drive die formers or dollies against the ends of steel or iron bars, rods or chunks of any suitable forging metal held in the die jaws. I have, however, illustrated in side elevation in Fig. 1 an operative doll connected to the throttle valve chest 10 by a hose 71. In this engine 70, a forging upsetting dolly 72 is mounted in operative forging upsetting relation to the die aws of the anvil and hammer block, and while it is necessary to have an upsetting dolly driving engine for some kinds of die-formed forgings making work, especially for making the rock cutting lips or points and also when forming locking lugs on collars and other forms of shank hits, the dolly driving engine as illustrated is not however an essential part of my present invention, but-forms a feature of it that operatively cooperates with it when producing certain kinds of forgings. My invention, however, operative dolly driving engine that can be used with my die-formed forgings makin machine. As more articularly described and claimed in the af dresaid copending application Serial No. 686,133, this engine 70 is slidably mounted on a slideway 73,, which driving engine 70, which is also contemplates the use of any ends of rock cutting drill as illustrated is formed on the end of an arm 73, that projects from the cylinder 8 of-the die-formed forgings making machine, and it is provided with a feed screw 74 to which a handle 7 5 is secured, by which the cylinder may be moved back and forth on its slideway far'enoughaway from the vise jaws to permit a dolly to be inserted in the guide flange, or to be removed from it when de- 1 sired. The engine is also provided with clamping bolts 75*, by which it may be; clamped in adjusted positions rigidly to its i slideway. The dolly- 72 is reciprocally im 1 pinged against the ends of drill bits or other Q articles held in the vise jaws, and is driven i on its. forward stroke by a hammer piston that is reciprocally mounted in the cylinder of the engine by the actuating fluid flowing through the hose 71 from the throttle valve, as is well understood and in a manner that is common to several of the dolly driving engines of drill bit forming and sharpening machines inpublic use. The dolly is moved on the rearward stroke of its reciprocal movements by a spring 76, which is arranged to effect its rearward stroke. A more complete description of a dolly driving engine, as well as a more complete description of the dolly, can be found in my above mentioned pending application, a

The operation of my improved die forging machine is as'follows: The throttle valve is manipulated by the operator. to admit the actuating fluid first to one end of the cylinder and its piston and thento the other end in any desired volume and in, alternating order, so as to alternately reciprocate the piston in the cylinder and thus raise the hammer block or to force itdown either slowly and with lightly engaging, pressing,

squeezing, or swaging strokes with the die jaw of the anvil, and when desired to. hold the hammer block die j aw down against drill teel or any other article that may lie in the die jaw of the anvil, with great pressure for as long a time as is necessary'to properly give a forging treatment to the same, or to drive it down with one or more rapid-successive hammer strikingblows of great force, the machine being capable of effecting blows of vanyv desired force or pressures,[

owing to its piston being provided with ends of different areas, the smaller end of which is adapted to simply raise the weight of itself and of the hammer block and its connections, while the upper end of the piston is given an area that permits it to be driven down against the anvils' die jaw-with hammer blows that'arc powerful enough to forge any size of steel or iron bars or blocks or slugs-of any forging metal used for medium sized forge work such as the forming, shanklng and sharpening of drill steel and the making of iron or steelholtswith heads of various kinds, nuts, spikes, gads, .ch'isels and other types of forgings, it only being necessary to provide die jaws of the form of each article that is to be made. n 4

My invention provides a small sized but powerful die formed forgings making machine suitable for the usecf mines, quarries, railway, irrigation, and mine tunnel rock work, and especially for use in machinery acting eflicient machine for making small die-formed forgings of various kinds, and of different characters, and while I have illustrated and described the preferred construction and arrangement of my improved diaformed forgings making machine, I do not wish to be limited to the construction and -arrangement shown, as changes may be made in its various parts without departing from the spirit of my invention.

l-Iaving described my invention, what I claim as new and desire to secure by Letters Patent, is: Y

1. In a drill-forming machine, a supporting base, a cylinder mounted on said base, an actuating fluid controlling valve on said cylinder, said cylinder and base being also provided with two cylindrical bores of different diameters, the larger of which is in said cylinder, apiston head of two diameters fitting reciprocally the two bores of said cylinder, the larger portion of which isinthe -vided with suitable actuating fluid inletand exhaust ports to the opposite ends of said vil portion mounted on said cylinder, and a of said cylinder and arranged abovesaid anvil to strike reciprocal blows against said anvil, said different diameters of the piston head and cylinder and" said actuating fluid ports being so relatively arranged that said hammer block is raised by the upward movement of the smaller diameter of said'pistonhead and is' lowered by the downward stroke of the larger diameter of said piston head,

'7 strike hammer striking blows against. said anvil.

2. In a drill-forming machine, a supporting base, a cylinder mounted on said base, said base and cylinder being provided with 'pistonbores of two difierent diameters, a piston'head having opposite end portions of different areas and fitting reciprocally in the bores of said base and cylinder, means including a controlling valve for reciprocating said'piston head, an anvil portion on top of said cylinder, vertically arranged slide-ways in said anvil portion, guide rods secured at one end to said piston. head and extending slid-ably through said slideways, a hammer block secured vertically above and over said to strike vertical reciprocating blows against -piston' l1ead from said throttle valvc an an},

piston head to said guide rods and arranged manufacturing plants that require a quick bore of said cylinder, said base being, pro 7 a hammer'block connected to the piston head whereby said hammer block is caused to said anvil, the opposing faces of said anvil and hammer block being provided with d-ie aws arranged to register opposite to each. other upon the downward movement of said hammer block.

3. In a drill-forming machine, the combination of a supporting base provlded with a cylindrical piston bore, a c on saidbase provided with that is arranged concentric to the bore in said base and is of much larger area, a iston head comprising a disk portion fitting inder mounted a cylinder bore a the larger bore in said-cylinder, and a stem ig -to the inlet and exhaust, ports of said base and cylinder, and arranged to operatively admit compressed air to them 4. In a drill-forming machine, the combination of the base, the cylinder mounted on said base, said base being provided with a small piston bore, and said cylinder being provided with a piston bore of much larger diameter than the piston bore of said base,

a piston head of two difi'erent diameters tting reciprocally in the piston .bores of said cylinder'and'base, said base and cylinder being provided with actuating fluid inlet and exhaust ports connecting operatively to said piston bores to reciprocate said piston head, an actuating fluid receiving and controlling throttle valve arranged on said cylinder and operatively connected to said cylinder inlet and exhaust ports to control the reciprocal movements thereof, aforging anvil portion on top of said cylinder, guideway apertures through said anvil portion and the top of said cylinder into its piston bore, bolts secured in said piston head and extending slidably through said guideways, a packing medium connected to said bolts for preventing leakage of actuatingfluid past said bolts through said guideways from said piston bore, and a hammer block secured to the ends of said bolts that project from said cylinder and anvil and arranged and adapted to be impinged against said stroke of said anvil in unison with and by the reciprocal piston head in said cylinder and base.

5. In a drill-forming machine, a lower member having an inner chamber of two diameters, a stationary anvil member mounted on said lower member, a hammer block mounted oversaid anvil-member, a

to be vertically re-- piston comprising a cylindrical lower portion fitting within the chamber along its portion of smaller diameter and a disk-sha ed head within the portion of said cham er of greater diameter, connections between said hammer-block and said piston, and means for controlling the supply of fluid under pressure to the opposite ends of said piston.

6. Ina drill-forming machine, a lower member having an inner chamber of two diameters, a mounted on said lower member, a hammer block mounted over said anvil-member, a piston comprising a cylindrical lower portion fittin within the chamber alon its port-ion 0' smaller diameter and a diskshaped head within the portion of said. chamber of at one end to said hammer-block and at the other end to said piston', and means for controlling the supply of fluid under pressure to the opposite ends of said piston.

7. In a drill-forming machine, a lower member having an inner chamber of two diameters, a stationary anvil member mounted on said lower member, a hammerblock mounted over said anvil-member, a piston comprisin tion fitting within the chamber alon its portion of smaller diameter and a iskshaped head within the portion of said chamber of greater diameter, vertical bolts secured at their upper ends to said hammerblock and at their lower ends to the diskshaped head of said piston, and means for controlling the supply of fluid under pressure to the opposite ends. of said piston.

8. In a drill-forming machine, a lower member having an inner chamber of two diameters, a mounted on said lower member, a hammerblock mounted over said anvil-member, a piston comprising a cylindrical lower portion fitting within the chamber alongits portion of smaller diameter and a diskshaped head within the portion of said chamber of greater diameter, vertical.

greater diameter, bolts secured a cylindrical lower porstationary anvil member stationary anvil member sage-ways in said lower anvil-member, ve'r- I tical bolts secured at their uppcr'ends't'o said hammer-block and at their lowerends to the dislcshaped head of said piston, and adapted to move in said passage-ways, and means for controlling the supply of "fluid under pressure to the opposite ends offsaid p1ston.'

9. In a drill-forming ma hine, a, lower member having diameters, a stationary anvil member mounted on said lower member, a hammerblock mounted over said anvil-member, a piston comprising a cylindrical lower por- 'an inner rhambcr of two tion fittin within the chamber along its portion of smaller diameter and a diskshaped head within the portion of said chamber of'grezite r diameter, vertical bolts In testimony whereof I aflix my signapassing through and secured at their upper ture in presence of two Witnesses. ends; to sand hammer o'lock and passlng through and secured at, their lower ends to JOHN. GEORGE LEYNER. the disk-shaped headof said piston, and

means. for controlling the supplyof fluid Witnesses:

under pressure to the opposite ends ofsaid GEORGE R. GRIEVE,

piston. G. SARGENT ELLIOTT. 

